Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58a6beda05b2bb0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 23:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4859857f65669d8e793858ace8075aa1 SHA-1: 5b514e3694b98f45fed08105fec05ff38aea305b SHA-256: e58a6beda05b2bb042bdb78f8c31a03c6a173df60443d75e8fd5f1422fd07411
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic of instructing users to open a password-protected archive, likely to bypass initial security scans. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://christschoolblr.in/userfiles/file/perovo.pdf In PDF document text
    • http://katyababash.com/images/uploads/file/tafaxa.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5c9c3a1b---67831797665.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/9918920568.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/aafdf12f5f5ecc47c780ed3ec3a6829e/9740068670.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/wemoweferagimajopuf.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1b45eaf5fe34ee29fab5fcac33b0cd77/tepiros.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/sovemevawikaja.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf7acd05a4---tusajojuwikupedijivi.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/3219703584.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16100170b1334b---dasamilazaxe.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210806155944112.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/98246660045.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/b70f32da4701b1d7607770eec57d2c39/soxowudigikige.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf86f293ee---50683292277.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/76013505799.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/70819608155.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611523da4bba5---99013876172.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/27184553210.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7be2d7cdc---98649413673.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/29094227747.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/86423929592.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/dinoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manual+maquina+de+lavar+lou%C3%A7a+electrolux+6+servi%C3%A7osPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 19172 bytes
SHA-256: 5b983c158185d0235ce2230744e98e9df63a29f222ab3907f4f9f57397eb5fe3
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 11304 bytes
SHA-256: 80f8d51c0ce9be600f35435d28896c6b85b7dd9357baca7c87df48af9ba26b6b

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